Electric now has +50% bonus against all Murmur and is a strong DoT status.
Viral status boosts electric but viral damage is resisted by murmur. We use Rank 0 viral mods to allow electric status to proc more often.

Since primed bane of murmur does not yet exist, regular bane is not really worth using.
[Serration] is flexible for [Rifle Elementalist] or [Primed Firestorm].

EVOLUTION GUIDE

Evolution II: Final Fusillade gives +51 damage. The last shot bonus doesn't apply to incarnon mode. The other option Plentiful Mayhem only gives +31 dmg and consumes all your ammo rapidly.
Evolution III: Pick any, but i prefer Swift Deliverance +50% projectile velocity to allow you to hit targets easier for charging of the incarnon form
Evolution IV: Survivor's Edge increases both CC and SC